@book { FinalCaseStudyRealNetworksRhapsody,
    title = "Final Case Study: RealNetworks Rhapsody",
    author = "Carolin {Kinder}",
    year = "2006",
    publisher = "GRIN Verlag",
    address = "München, Germany",
    doi = "10.3239/9783638513043",
    url = "https://www.hausarbeiten.de/document/56677"
}